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Old 26th July 2005, 05:44 PM   #11
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Join Date: Dec 2004
Location: South Florida, USA
Bret, I've toyed with notions of conjoined vertical panels, each adjacent panel delayed, and also panels divided into smaller vertical stirips, each adjacent strip delayed. As for bass, I'm looking into a non-dipolar design with a few other tricks in mind. I'm not nearly ready to claim victory with this set of new design ideas, so I'm going to say little more until I have something that works enough to tell about.

Charles, which commercial design with the aluminum rods and RC "delays" are you referring to?
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Old 27th July 2005, 06:50 AM   #12
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Charles, which commercial design with the aluminum rods and RC "delays" are you referring to?
I'll try to remember.


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Old 1st August 2005, 10:55 PM   #13
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Has anyone actually measured the inductance of the coils in the delay lines?

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Old 18th August 2005, 06:11 PM   #14
orjan is offline orjan  Sweden
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Well not measured...but, according to Peter Baxendal in Loudspeaker and Headphone Handbook the inductors has a nominal value of 3H. Further he says the lattice cap and the cap in the coil combined is about 132pF giving the delay line a characteristic impedance of 300kohm
Then "the air-cored inducters are sufficiently close spaced for mutual inductence between them to be very significant..."
Also pointed out the coils has a few shorted turns to damp the delay line.

Last I would recomend reading the chapter on electrostats in this book (isbn 0
240 513711) if you are interested in quad electrostats 57 and 63. Most theory so if you want building instuctions read another book.

Now if someone could measure the resistance in the coils..I think it can be done just measuring on the pcb.
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